Canadian researchers have found that tailoring one’s diet using genetic information improves eating habits better than following standardized diet advice. The researchers collected data on the intake of caffeine, sodium, vitamin C and sugar from 138 healthy young adults who were then divided into two groups. One group was given DNA-based dietary advice while the other group was given current standard dietary advice. Dietary habits were checked after three and 12 months. Those who received DNA-based dietary advice showed dietary improvement after three months and even more so after a year. The genetic dietary advice was provided by a University of Toronto start-up company that develops genetic test kits for personalized nutrition.
"Disclosure of Genetic Information and Change in Dietary Intake: A Randomized Controlled Trial. ", PLoS ONE, November 21, 2014
A Canadian review of clinical trials involving four commercial diet plans -- Atkins, South Beach, Weight Watchers, and Zone -- that promise not only weight loss but improved cardiovascular health found that all helped dieters lose weight in the short term. However, the trials provided little evidence that the diets worked in the long run, or that they improved heart health. Weight Watchers dieters lost an average 7.7 to 13.2 pounds after a year compared to 1.8 to 11.9 pounds with usual care. But at two years, dieters had regained a lot of the pounds. In a head to head comparison of diets, those on Atkins lost the most, an average 4.6 to 10.3 pounds. The control group lost about 4.85 pounds.
"Long-Term Effects of 4 Popular Diets on Weight Loss and Cardiovascular Risk Factors: A Systematic Review of Randomized Controlled Trials. ", Circulation: Cardiovascular Quality and Outcomes, November 21, 2014
U.S. researchers who compared the weight loss results of different types of diets found that a strict vegan diet worked best at cutting pounds. The study involved 50 overweight individuals over six months who were randomly assigned to vegan, semi-vegetarian, pesco-vegetarian, vegetarian or omnivorous diets. At the end of six months, individuals on the vegan diet lost more weight than those on a mostly plant-based diet, and those on an omnivorous diet (a mix of animal products and plant based foods) by an average of 4.3 percent, or 16.5 pounds. The researchers also found that vegan diets improved macronutrients more than other diets.
"Comparative effectiveness of plant-based diets for weight loss: A randomized controlled trial of five different diets. ", Nutrition, November 15, 2014
Dutch researchers have determined that, despite earlier observational studies, taking folic acid and vitamin B12 over long periods of time does not reduce the risk of memory loss. The study was conducted in 2,919 older patients with high levels of the amino acid homocysteine – thought to be associated with memory loss. Folic acid and vitamin B12 do lower homocysteine levels, but after two years of supplementation the researchers found no difference between the patients who took supplements and those who took a placebo in the scores on thinking and memory tests.
"Results of 2-year vitamin B treatment on cognitive performance: Secondary data from an RCT. ", Neurology, November 12, 2014
Add another eating disorder to the list: orthorexia nervosa, a condition in which people obsessed with eating healthful, “clean” food end up hurting themselves. More and more doctors and dietitians are treating people determined to cleanse their diet of meat products, gluten, dairy, sugar, etc., become obsessive compulsive, lose way too much weight and even become malnourished. Very little research has been done on the phenomenon, but researchers in Colorado recently devised a list of criteria for doctors to use to diagnose orthorexia. The criteria could also be used to expand research on the condition, which is not yet listed in the official manual of mental disorders.
"When Healthy Eating Calls For Treatment", The Wall Street Journal, November 10, 2014
A new study on the impact of diet sodas on gut microbes contributes more insights -- and probably more confusion – to the debate over whether diet drinks are good or bad for health. Some research suggests that diet drinks do help people cut calories and ward off weight gain. But the new study says diet sodas alter intestinal microbiota in such a way that the risk of metabolic disease, including type 2 diabetes, increases. Skeptics warn that one study among seven people does not provide enough scientific evidence. So, as the debate rages on, everyone agrees that more, and larger, studies are needed to settle the issue.
"Diet Soda May Alter Our Gut Microbes And Raise The Risk Of Diabetes", National Public Radio, November 07, 2014
Euromonitor summarizes the pros and cons of eating sugar in a new study that tries to put the debate in context as the amount of scientific research linking sugar to obesity increases. Among the cons that contribute to sugar’s “demonization”: refined sugar is addictive; causes tooth decay; has no nutritional value; and has been linked to obesity, insulin resistance, type 2 diabetes and heart disease. On the other hand, the sugar industry says that sugar alone cannot be blamed for obesity because saturated fats, carbohydrates and sedentary lifestyles also play a role. And sugar makes processed foods more palatable by providing texture and acting as a preservative.
"The Backlash Against Sugar: The Facts", Report, Euromonitor International, November 07, 2014
Researchers in Virginia who analyzed the nutritional value of more than 750 school meals with more than 560 packed meals given to pre-K and kindergarten students in three schools over five days found that school lunches were generally more healthful for kids. School lunches were lower in fat and higher in protein, though they did tend to contain more sodium. Packed lunches were less likely to have fruits, vegetables, sugar-free juice and milk, and had more snacks such as chips and crackers. "There were some really healthy packed lunches,” one researcher said. “But overall, they were pretty unhealthy."
"School Lunches More Nutritious Than Home-Packed Lunches: Study", HealthDay , November 07, 2014
Nutrition writer Linda Milo Ohr has scoured recent scientific research to compile a list of foods and nutrients that ward off hunger pains and keep you feeling full longer. At the top of the list is protein, especially eggs for breakfast, but also protein snacks in the late afternoon to keep unhealthy nighttime snacking under control. Other appetite-curbing foods include: whole grains and fiber; almonds; pulses like dried peas, edible beans, lentils, and chickpeas; saffron; and Korean pine nut oil.
"Combating Hunger Pains. ", Food Technology, November 04, 2014
A U.S. study in mice finds strong evidence that a diet rich in walnuts can help prevent the onset of Alzheimer’s disease. Mice fed walnuts showed significant improvement in learning skills, memory, and motor development, as well as a reduction in anxiety. The key to the health benefits of walnuts is their high antioxidant content, which reduces oxidative stress and inflammation in brain cells. The research group examined the effects of dietary supplementation on mice with 6 percent or 9 percent walnuts, which are equivalent to 1 ounce and 1.5 ounces per day, respectively, of walnuts in humans.
"Dietary Supplementation of Walnuts Improves Memory Deficits and Learning Skills in Transgenic Mouse Model of Alzheimer's Disease. ", Journal of Alzheimer's Disease, November 04, 2014
The FDA recalled 274 dietary supplements between January 2009 and December 2012 because they were adulterated with ingredients that had a reasonable possibility of causing serious harm or death. In a new study that focused on 27 (9.9 percent) of the recalled supplements, Harvard Medical School scientists using gas chromatography/mass spectrometry found that two-thirds containing adulterants were still on store shelves an average of 34.3 months (range 8-52 months) after the FDA recall. Supplements still being sold were adulterated in 85 percent of sports enhancement products, 67 percent of weight loss products, and 20 percent (1/5) of sexual enhancement products. Sixty-five percent of U.S.-produced supplements remained adulterated with banned ingredients.
"Presence of Banned Drugs in Dietary Supplements Following FDA Recalls. ", JAMA, November 03, 2014
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Nutrition Journal, November 24, 2014
Clinical Journal of the American Society of Nephrology, October 30, 2014
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